Preparation method of pasty polytetrafluoroethylene dispersion resin for pushing and extruding

A polytetrafluoroethylene and dispersing resin technology, which is applied in the field of preparation of tetrafluoroethylene dispersing resin for paste extrusion, can solve the problems of unevenness, wide molecular weight dispersibility, insufficient fiberization and the like

Active Publication Date: 2014-07-30
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the extrusion pressure fluctuates widely during the entire pushing and extrusion process, and the extrusion line is discontinuous, not straight, not smooth, and even longitudinally cracked
[0006] (2) The polytetrafluoroethylene dispersion resin obtained by coagulation and granulation of the polytetrafluoroethylene polymer solution after post-treatment and granulation by the general polymerization process has a wide molecular weight distribution and a low average molecular weight. The push and extrusion process is always evenly spewing oil, which also cannot meet the requirements. The main features are that the push and extrusion force fluctuates in a very wide range, the appearance is discontinuous, not straight, and not smooth, and the strength of the push and extrusion line is poor. The essence of the cause is Low average molecular weight and wide molecular weight dispersion
In the process of pushing and extrusion, the fiberization of the product material is not sufficient

Method used

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  • Preparation method of pasty polytetrafluoroethylene dispersion resin for pushing and extruding
  • Preparation method of pasty polytetrafluoroethylene dispersion resin for pushing and extruding
  • Preparation method of pasty polytetrafluoroethylene dispersion resin for pushing and extruding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The reaction kettle is 50L, equipped with a ribbon stirrer, a jacket for heating (low pressure steam), and a cooling medium (constant temperature industrial circulating water). Add deionized water, a total of 20% (wt) perfluorooctanoic acid substitute (perfluoroether carboxylate, non-C-8 fluorosurfactant), paraffin wax (the preparation method of purified paraffin wax is Paraffin wax is melted at 75-80°C, mixed with 1-3% reducing agent aqueous solution, kept warm for 3-4 hours, and cooled to obtain, the reducing agent is sodium sulfite or potassium bisulfite), F 113 Components, vacuumize and replace with nitrogen to analyze the oxygen content of the system ≤ 30ppm, and raise the temperature. When the temperature in the kettle rises to 70°C, start stirring, and when the temperature in the kettle is 75°C, stop heating, inject ammonium persulfate and succinic acid peroxide initiator from the metering pump, and then add gas-phase tetrafluoroethylene monomer, The polymerizat...

Embodiment 2

[0037] Embodiment 2 (comparative example)

[0038] The preparation method is the same as in Example 1, except that no ammonium persulfate is added to the initiator, and the reaction time is 245 minutes.

Embodiment 3

[0039] Embodiment 3 (comparative example)

[0040] The preparation method is the same as in Example 1, and the difference is that the initiator does not add F 113 , The reaction time is 270min.

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Abstract

The invention relates to a preparation method of pasty polytetrafluoroethylene dispersion resin for pushing and extruding. By the preparation method, polymerization is carried out by using high-purity tetrafluoroethylene monomers as raw materials and deionized water as media under the action of initiators, fluorine-containing auxiliaries, dispersing agents and stabilizers; and polymer molecular weight can be improved, and relative standard density ranges from 2.140 to 2.145. Dispersed resin powder particles obtained after polymerization liquor is processed have excellent oil absorption capacity and can be uniformly released during pushing and extruding so that good lubrication is achieved in the whole pushing and extruding process. When wire products are extruded, extruding pressure is lowered, the wire products are continuous, straight and smooth apparently, and the qualified rate of the products is increased and can be more than 98%.

Description

technical field [0001] The invention relates to the technical field of polymer resins, in particular to a preparation method of tetrafluoroethylene dispersion resin for pasty pushing and extrusion. Background technique [0002] PTFE resin has corrosion resistance and weather aging resistance, and it can be used for a long time in the temperature range of -250 ~ 250 °C. PTFE resin is a thermoplastic engineering plastic, and its comprehensive performance is still the best so far. [0003] Polytetrafluoroethylene resin, it starts to melt at 327°C, completely melts at 343°C, and begins to crack when the temperature rises to 380°C. If it is cracked in an oxygen-free environment, the product is 100% tetrafluoroethylene monomer. The molten state of PTFE has two characteristics: (1) The melting temperature of PTFE is very close to its decomposition temperature and product processing temperature; (2) The viscosity of PTFE in the molten state is extremely high. When its melt is at 3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F114/26C08F2/18
Inventor 张建新陈立义胡显权何炯苏小龙
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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